There is a method described in this article that can be used even if you can't find a manual.
https://www.epicurious.com/expert-advice/how-to-find-adjust-wattage-power-of-microwave-oven-article
Quoting: "To find an approximation of your machine's wattage, fill a microwave-safe liquid measuring cup with 1 cup cold water. Microwave on High and keep an eye on it, noting how long it takes for the water to come to a boil:
- 1 1/2 minutes: 1,200 watts
- 2 minutes: 1,000 watts
- 2 1/2 minutes: 800 watts
- 3 minutes: 700 watts
- 4 minutes: 600 watts
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